Discover the most frequently asked Phone system questions

What is Sip trunking?

Sip trunking stands for Session Initiation Protocol. It’s an important technology to understand modern VoIP systems, where an enterprise network is connected to the rest of the world not by using the plain old telephone system, but by using the internet, therefore allowing cheaper communications, especially when long distance calls are concerned.


Technically, Sip trunking is a method for initiating voice over IP communications through proxy servers. A “trunk” is in fact a line between the two correspondents. This line can either be virtual or physical, dedicated or shared. More often than not, Sip this technology will rely on dedicated or leased resources, giving their users an internet connectivity that users of the public internet can only dream of. This has its implications on call quality, but on security too, as channels are not shared with other users.

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With Sip trunking, thousands of virtual lines can be created simultaneously, allowing thousands of correspondents to be reached at the same time by the subscriber, making this technology interesting for call centres.


Like other VoIP standards, Sip trunking allows media blending, multimedia communications and unified communications.


Another interesting feature of this technology is that thousands of geographical numbers can be used by the subscribers, automatically generated by the system matching parameters. So no matter where the Sip trunking user is located, he can reach and be reached by using a local number corresponding to an area near the correspondent’s physical location.


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